Gear-generating machine



June 8, 1925. 1,587,709

S. H. EARL GEAR GENERATING MACHINE Filed Oct. 4, 1924 2 Sheets-Sheet 1 INVENTORLI an! June 8 1926.

1,587,709 s. H. EARL GEAR GENERATING MACHINE Filed Oct. 4, 1924 2 Sheets-$heet 2 IN V EN TOR.

Patented June 8, 1926.

UNITED STATES PATENT OFFICE.

SCI-IUYLER H. EARL, OF ROCHESTER, NEW YORK, ASSIGNOR TO GLEASON WORKS, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

GEAR-GENERATING MACHINE.

Application filed October 4, 1924. Serial No. 741.582.

The invention relates to gear cutting machines, and more specifically to the tool mechanism of such machines.

One of the objects of this invention is I 5 to provide means whereby a change in the pressure angle of the gear to be generated may be effected by movement of the tool alone. v

A further object is to provide means whereby movement of the tool, which represents a tooth of the basic member of the system on whichthe blank rolls, will efiect a result equivalent to .a change in the ratio of roll between the members controlling the relative movement of the tool and bank.

A preferred embodiment of my invention is illustrated 111 the accompanying drawings, in wh1ch:-

Figure 1 is a view in front elevation of the a gear cutting machine of the type to which.

my invention may be adapted;

Fig. 5- is a perspective view of used to adjust the tool;

Fig. 6 is a diagrammatic view showing how the pressure angle may be changed by an adjustment of the tool; and

Figs. 7 8 and 9 are sectional views showing various adjusted positions of the tool.

The invention is particularly pertinent to gear cutting machines of the generating type, in which a planing tool is employed to generate gear teeth on a gear blank by the relative movement of the tool and blank, and it is in connection with such a machine that my improvement is illustrated.

The relative motion between the tool 1 and the blank 2 may be effected by any suitable means. In the form of machine illustrated, the tool is reciprocated across the face of the blank by mechanism of any desired type, such as that shown, for inthe wedge stance, in the co-nending application of Means (not shown) are provided for oscillating the cradle and the movement of the cradle causes the segment 6 to move on the segment 7 giving the blank the desired rolling or generating motion. The segment 7 may be a portion of a crown gear in which case the segment 6 would represent a section of the gear to be cut, or both segments 6 and 7 may be bevel gear so 'ments as described in the co-pending app ication above referred to.

When it is desired to change the ratio of roll or relative motion between the tool'and blank,- it has heretofore been necessary to either substitute a new segment for the segment 7 or to provide some means of adjustment for the latter segment. Variations in the pressure angle of the blank being cut from the desired pressure'angle, due to un-.

avoidable errors in the machine, could only be corrected in the same way. I have discovered, however, that by tilting the tool angularly with reference to the face of a tooth of the blank to be cut variations in the pressure angle can readily be corrected and an adjustment of the pressure angle made possible, so that the provision of a multiplicity of gear segments for each machine is rendered unnecessary and the loss of ri gidity, which is a result of making one of the segments adjustable, is avoided.

Any suitable means may be provided for tilting the tool. As shown, the tool 1 is secured to the holder or head 9. against a seat provided thereon, by a pair of'bolts 10 which thread into the tool and pass through aligned openings 11 and 12 in the head and a collar 13 interposed between the head and the heads of said bolts.

The tool holder 9 is secured to the tool slide by bolts 14 which pass through slots 15 in the holder, and is adjustable vertically with reference to the slide by means of the bolt 16. The tool holder is provided on its lower face with a tapering seat 17 along which the wedge 18 can be adjusted. This wedge is adapted to contact with the tool at one side of the bolts 10 so that by adjust being suflicient play between the bolts 10 and the side Walls of the openings 11 of the head 9 to permit such rocking moyement. The tool, however, is always rigidly Secured to the support by the bolts 10,.sinee the tool contacts at one side withthe holder and a the other side With the Wedge.

By moving the tool, then, the pr. ssure angle of the tooth to be cut' may be changed Without changing the segment 7 and a re.- sult equivalent to a, change in the ratio of roll, that is, a change in the segments 6 {and 7 or either. of them. may be accomplished by thesame tilting action. For the purpose of v insuring proper adjustment, of the. tool, the wedge maybe providedv with graduations 19in degrees an minutes, or other angular measurement r ch indicates the amount it neces ary to move the tool to effect a corresponding cl. is in the pressure lYhile I haveshovvn a Wedge asthe means for tilting the tool, it is obvious. that any other suitable means. may be employed for the same purpose; and; while I have shown my invention in. connection with a machine in which the relative roll is obtained by means of a segment fixed; to the gear rolling on a relat vely fixed segmentsecured to they frame, it is obvious thatmy invention is ap phcable to other machines of a generating character, 1n W'lllCll. other; means are an ployed toefi'ectthe necessary gen'eratingrolt and'that either the tool or blank. may par take Wholly of the generating rollor the.

roll may, in part, be applied to each.

NVhile I have illustrated and described a preferred embodiment of the invention, I do. not desire to. be restricted to'the form shown since my invention is capable: of modification Within the scope of the invention and the limits of. the appended claims.

1. In a machine for producinggears, a tool, a blank'support, means for reciprocating the tool across the face of the blank and means for adjusting the tool'to vary the inclination of. its cutting edge relative to the face of a tooth to be cut to thereby vary the pressure angle of the gear. being. cut.

2. In a machine for producing gears, the combination with a blank support, a tool support, a tool mounted on said support, andmean's for reciprocating saidtool support to move the tool across the face of the blank, of means for securing the tool to its support and means adapted to engage the tool; atone sideof said securing means to move the tool bodily about an axis at the other side of said securing means to vary the inclination of the. cutting edge of the tool relative to the tooth face to be cut.

3. In a machine for producing gears, the combination .With a blank support, a tool support, a tool mounted on said. support, and means for reciprocating said tool support to move the tool across the face of the blank, of; means carried by said tool sup port and movable longitudinally of. the. tool to. effect movement 'orthe tool angularly relative to the tooth face to be cut. to thereby predetermine the pressure angle of the gear to be cut. I

l. In a machine for producing. gears, the combination. with a. blank support, a tool support, atool mountedon said support, and; means for reciprocating said tool. support to. movethe tool acrossthe face of the blank, ofv a Wedgemember carriedby said @001 support and meensfor.adjustingsaid Wedge memberto move the tool: angularly relative to a tooth face to be cut to thereby predeterminethe pressure angle of the gear to be cut.

5. In a machine for producing gears, the combination With a blank support, a tool support, a toolmounted on said support, and means for .reci13rocating saidtool support to move the tool across the face of the blank, of means forsecuring the tool to its support and'a Wedge member adaptedto engage the tool at one side of said securing means to move the toolv bodily about an axis at the other side of said securing means to vary the inclination offthe cutting edge of the tool relative to a tooth face ofthe. gear to be out. p i

In Witness, whereof, I- luwe hereunto set my signature.

soHUrLER- EARL. 

